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Statutory Insurance Financial Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Statutory disclosures |  |  |
Statutory reserves assumed by affiliated reinsurance subsidiaries | $ 19,013.3 | $ 18,474.2 |
Admitted assets under prescribed and permitted statutory accounting practices | 4,254.5 | 4,153.8 |
Statutory net income increase (decrease) | 1,093.6 | 1,285.0 | $ (1,563.1)
Statutory capital and surplus | 4,695.5 | 4,753.4 | $ 4,304.4
Insurance ceded out of ULSG reserves by affiliated reinsurance subsidiaries | $ 10,847.6 | 10,406.3 |
Bermuda Reinsurer [Member] |  |  |
Statutory disclosures |  |  |
Statutory net income (loss) |  | 190.4 |
Statutory capital and surplus |  | $ 22.2 |

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- Definition Amount as of the balance sheet date of assets admitted due to applying state prescribed and permitted statutory accounting practices rather than statutory accounting practices prescribed by the National Association of Insurance Commissioners. + References No definition available. + Details
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- Definition Amount of insurance ceded out of ULSG reserves by affiliated reinsurance subsidiaries in Vermont. + References No definition available. + Details
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- Definition Amount of increase (decrease) to the regulatory capital required for the period determined using accounting principles prescribed or permitted by insurance regulators due to use of reporting practice adjustments permitted in reinsurance. + References No definition available. + Details
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- Definition Amount of statutory reserves assumed by affiliated reinsurance subsidiaries. + References No definition available. + Details
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- Definition The amount of statutory capital and surplus (stockholders' equity) as of the balance sheet date using prescribed or permitted statutory accounting practices (rather than GAAP, if different) of the state or country. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(23)(c)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 944 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477908/944-505-50-1 + Details
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